About the principle of small freeze dryer at work

      A small freeze dryer is a technology that uses the principle of sublimation to dry. It is a process in which the dried substance is quickly frozen at a low temperature, and then in an appropriate vacuum environment, the frozen water molecules are directly sublimated into water vapor and escaped. . The product obtained by freeze-drying is called lyophilisate, and this process is called lyophilization.

　　The substance is always at a low temperature (frozen state) before drying, and ice crystals are evenly distributed in the substance. The sublimation process will not be concentrated due to dehydration, and avoid side effects such as foaming and oxidation caused by water vapor. The dry substance is porous in the form of a dry sponge, and its volume is basically unchanged. To the greatest extent, prevent the physical, chemical and biological denaturation of dry substances.

　　A small freeze dryer is composed of refrigeration system, vacuum system, heating system, electrical instrument control system. The main components of the freeze dryer are drying box, condenser, refrigeration unit, vacuum pump, heating/cooling device, etc. The working principle of the A small freeze dryer is to freeze the dried items to below the triple point temperature, and then directly sublime the solid water (ice) in the items into water vapor under vacuum conditions, remove them from the items, and dry the items . After pre-processing, the materials are sent to the quick-freezing warehouse for freezing, then sent to the drying warehouse for sublimation and dehydration, and then packaged in the post-processing workshop. The vacuum system establishes low-pressure conditions for the sublimation drying chamber, the heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cold energy to the cold trap and drying chamber.

　　This equipment adopts high-efficiency radiant heating, and the material is heated evenly; it adopts high-efficiency water trap and can realize rapid defrost; adopts high-efficiency vacuum unit, and can realize oil-water separation; adopts parallel centralized refrigeration system, multi-channel cooling on demand, working conditions Stable and energy-saving; using artificial intelligence control, high control precision, easy to operate. The quality requirements for freeze-dried products are: unchanged biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate, and low residual moisture. To obtain high-quality products, you should have a more comprehensive understanding of the theory and technology of freeze-drying. The freeze-drying process includes three stages: pre-freezing, sublimation and re-freezing. Reasonably and effectively shorten the freeze-drying cycle has obvious economic value in industrial production.